You are asking a Philadelphian to realize how big of a jerk they are... That's a losing battle with no end.
Well it is possible the Flyers might win the cup. If there was no chance then they wouldn't be in the finals, however, I like the Hawks' chance more.
I've been a fan of the Blackhawks since I discovered hockey back in '95 (before the Nordiques moved to Colorado) and once I pick a team I stick with it. I admire loyal fans regardless of who they root for, and when I and others who are rooting for opposing teams butt heads all the better as long as it's in good fun.
Edit* It should be noted that not all fans think the same way. I wouldn't have been so bold myself but to each their own. *rubs his playoff beard all over ericajoanne's cheek s'moar* Get you some!